condition mean min max ZT0-3 49.167882 49.167882 49.167882 ZT4-7 100.832251 100.832251 100.832251 ZT8-11 190.7769685 190.7769685 190.7769685 ZT12-15 167.0663995 167.0663995 167.0663995 ZT16-19 71.9635205 71.9635205 71.9635205 ZT20-23 50.544615 50.544615 50.544615